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Unaudited Quarterly Financial Data (Tables)
 12 Months Ended
Dec. 31, 2011
Unaudited Quarterly Financial Data [Abstract]  
Schedule of Quarterly Financial Information [Table Text Block]

 
Three Months Ended,
 
March 31
 
June 30
 
September 30
 
December 31
 
(in millions, except per share data)
2011
 
 
 
 
 
 
 
Net sales
$
645.6

 
$
686.2

 
$
647.6

 
$
605.6

Gross profit
115.4

 
130.5

 
103.5

 
105.7

Net income
36.6

 
47.9

 
22.6

 
30.0

Net income attributable to AAM
37.7

 
49.2

 
24.8

 
31.1

Basic EPS (1)
$
0.51

 
$
0.65

 
$
0.33

 
$
0.41

Diluted EPS (1)
$
0.50

 
$
0.65

 
$
0.33

 
$
0.41

 
 
 
 
 
 
 
 
2010
 
 
 
 
 
 
 
Net sales
$
521.9

 
$
559.6

 
$
618.2

 
$
583.3

Gross profit
87.3

 
98.9

 
113.9

 
101.6

Net income
16.2

 
25.3

 
38.7

 
34.3

Net income attributable to AAM
16.3

 
25.4

 
38.8

 
34.9

Basic EPS (1)
$
0.23

 
$
0.36

 
$
0.54

 
$
0.49

Diluted EPS (1)
$
0.22

 
$
0.34

 
$
0.52

 
$
0.47